hellppp me !

Hello guys i have one concern regarding my " appearance / beauty " which is lips darkening ! They used to be pink and nice but then they started getting darker specially the upper one ... I threw all of my " cheap " products coz some told me that cheap product might make it worse i'm using la mer's lip balm and i'm noticing a bit of improvement ... I do exfoliate them regularly with lush's sugar scrub ... I use a sun block for my lips from the body shop < which by the why i don't really like ... Question is ! Do u know any methods to get rid of it :( it's really frustrating i look like a heavy smoker even though i never smoke * no offence to all smokers* ,,, and can someone suggest a good lip balm with spf ? Thank u